I am looking for an IC that will take 12 volts DC input and generate +/- 5 volts DC out at a few milli-amps?
To drive a couple of LCD panel meters.
JERD
"JERD" Not and IC, but a mini inverter module like this will do it : Nice price ($ 12.45 + ) but no stock at present. Same goes for two other similar ones. ........ Phil
Read the full replyI am looking for an IC that will take 12 volts DC input and generate +/- 5 volts DC out at a few milli-amps?
To drive a couple of LCD panel meters.
JERD
"JERD"
** Not and IC, but a mini inverter module like this will do it :Nice price ($ 12.45 + ) but no stock at present.
Same goes for two other similar ones.
........ Phil
"Geoff C"
** Neither item is no longer stocked by Farnell.Alternatives offered are out of stock except for this one at $25.77 +
....... Phil
"JERD" wrote in news:bea7h.67422$ snipped-for-privacy@news-server.bigpond.net.au:
Farnell 868-9792, 3kV isolation, 10 to 100mA.SMD. $14.46
or
868-9873 1kV isolation at $10.75.just add caps.
There wont be an IC as such, unless you look at some of the Maxim switched capacitor converters.
Watch out for these, some I have used (from Farnell) do not regulate at very low loads like a few mA.
These are probably better for small loads like an LCD panel.
Dave :)
Try a MAX232 serial interface driver. It doesn't meet your specs exactly. It will do the following:
Cheers Glenn
Could you approach it slightly differently by using 0/5v/10v and set the common to be 5v? I suppose it depends what the rest of your circuit is running at, but assuming all you other logic uses +5V then you could use a
7810 on the 12v supply to give your +5v rail, the output from a 7805 to give you your 0v rail, then when you want -5v you just use the ground from the original +12v supply.Cheers, Gadget
Hi JERD,
I bought some 12v to 9v DC-DC converter modules from (not to be confused with Altronics)
Also, these modules appear similar to the one I bought, but you may have to do a bit of searching to find out who sells them.
JERD wrote:
The old ICL7660 can do something like that, though you would need to reduce the input voltage by putting a regulator before the 7660.
There are probably plenty of newer parts but perhaps the old 7660 is easier to find.
Chris
A few milliamps? Why not just use a two 7805s have ones ground beind the others outputs and you will end up with +5 and +10.
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